Coating composition



' Patented .inne s, 1939 gUNITED STATES No Drawing.

PATENT oFFica humm-1.11am

Application No.l56,4. lnennlymltll 1 cin-n. (a. 134-11 VThis invention relates to improvements in the production of coating compodtions which oomprise an aqueous solution of a phosphoric acid and' a pigment-like oxidic compound, in particular 6 an oxidic compound of an element selected trom Y the group consisting of the rst columns of the fourth, sixth and seventh group and of the iron group of the periodic system. Such coating compositions are described in the United States applicaton Ser. No. 76,769, led April 28th, 1936.

The 'said coating compositions are applied'at ordinary temperature in the samejway as oil f paints, they-set or harden in the air orby moderate and yield adherent coatings on substrats, such as metals or porcemin We havenow found that the composi# tions or the said kind can be improved by incorporating therewith aluminum hydroxide which may abo contain alumininn oxide. When using 2Q reversible colloidal aluminum hydroxide, such 'as is obtainable according to the United Statesv Patent No. 2,085,129 and United States application Ser. No. 9,589, filed March 6th, 1935, excellent coating compositions are obtained which A vmi yield lustrous coatings. When employing many other products, as for example 50 perce'nt oommercial aluminumhydroxide paste, matte iilms are formed. The amount of aluminum hydroxide maybe wide limits. 'A lmmay 30 even be produced with aluminum hydroxide and phosphoric ywcidalone, butit has lno great' cover- 'I'he said coating compositions are especially suitable for absorbent substrats, such as' wood,

. paper, cardboard,.textiles, natural stones, brickworkandthelike.. 'i'heydonotsinkintcsuch substratao'r onlysinkintoaslight extent and` 'yield veryy good mms. The'compositions may also'bewell employed asprimingorkniilng'oom- 40 positions. Theymay beeoveredwithothercoatingagents,su chas0ilpaints.vAlth0ughthey are mainly intended for use with absorbent substrata, they mayvalso be used'on'nou-ahsobent substrats because they aresuperior in thdr capacity for-*being 'painted and dried and also in the density of .their lms to compositions according tothe said U. S. application 76,769. in

The following examples vwill further illustrate the nature of this invention but fue invention is`not restricted tothese examples. The parts Vare by'weight.

Example 1v u 1oopnrtsdfeoppersilinte1oopnmoruuni- Vumdioxiiie.5lpartsotl'evei'sihlealuminum Thehardmimisgreatlyaoleratedbydrying inaslightlyammoniacal case'hardeovelnglayersarefonned. Emple3 eowttormmpsmnfnnimzopnrtsnr 4iron oxide, 20 parts-ofreversible aluminum hydmxidewntdiningsnpereent ciano; ob-v tainedndingtduienidapnlicatinnselj-NO- 9,589and140putsofacidhavmg spediicgravltyofliatw'aaremixedt' gether. Theisappliedtowoodconironintheform'ofmxtty.'1heputty allobepolished.

getbenf The may be employed forY coating `noli-absorbent,- as for example iron, sub- Vstrata.,inthenlm:wayasthoseobtainableacoordingtotheioregdngenmples.

xpx-tootta1c.40parlzsofknolin,lparts of-ironoxikparhotthereverslblealuminmn hydroxidereferredtoinEnmple'SandSOparts o! aspeoiiic gravity of lznmaarestirredintoahomogeneous mass. Thismaybei'nedasaprimingorcovering 2l l l v- 3,161,290

Costing compositions of the consistency of oil group and the iron group of theperiodic system, paints, comprising an aqueous solution of a phoswhich sets and hardens with the phosphoric acid. phoric acid having a specic gravity of 1.2 to -and a reversible colloidal aluminum hydroxide. A

1.3 and a. pigment-like oxidic compound of an .n element selected from the groupvconsisting of\ ANsGEoR mmm. 5

the rst columns in the fourth, sixth and seventh FRIEDRICH ER. 

